Sometimes what you see in the Activity Center does not always reflect what you see in other parts of the console.
The following queries can be used to help you understand why this is:
Software Catalog specific
--Newly discovered/undefined software
exec spAC_GetUnknownSoftware
--Managed software products
exec spAC_GetProductsManagedNotIncludeDefinitions @ManagedInt=1,@DefaultImageUrl='/img/product/software_prod_default.png'
--Unmanaged software
exec spAC_GetProductsUnmanagedOrDefinitions @ManagedInt=2,@DefaultImageUrl='/img/product/software_prod_default.png'
Software Product specific
--Unassociated components
exec spAC_GetComponentsNotAssociatedToProducts @ManagedInt=2,@DefaultImageUrl='/Altiris/SoftwareManagement/Images/Software Component.gif'
--Product license data
exec spAC_GetSoftwareProductLicenseData @SoftwareProductGuid='guid'
--Software usage
exec spAC_GetSoftwareInstalledUsed @SoftwareProductGuid='guid'
--Computers with software
exec spAC_GetComputersBySoftwareProduct @ComputerName=N'%%',@SelectTop=1,@Trustee=N'{2E1F478A-4986-4223-9D1E-B5920A63AB41},{582029E2-FC5B-4717-8808-B80D6EF0FD67},{7091A13C-55C3-4E51-B164-8955EE25E1C2},{B760E9A9-E4DB-404C-A93F-AEA51754AA4F},{E9A2F3F5-19C0-481E-8C77-3CABF5E64C77}',@SoftwareComponentGuids=N'guid'